The spawn rates on the Alhoon, the coal, and the Queen... they seem fine. Demonologists will also fill up given time. Silver mines, as well, because they're deadly and there's absolutely no reason to go there other than the XP. Perhaps some of these places remain decent because they're deadly enough, or far enough away, that people aren't *constantly* hitting them. I can at least count on, after a few days, once in a while having a good high spawn with them. The swamp and forest fanes get to higher levels because they're more out of the way, and they're much deadlier now (and, the forest fane because the loot is still broken, so it's extreme deadliness is often just undertaken for the enjoyment of a good, long run with constant danger.)
A lot of other places... well, I think because they're weaker dungeons, and because we've had an influx of new people, these places stay farmed. I haven't seen a high vampire spawn in forever. I haven't seen a /blaspheme/ in forever. I check the place out of force of habit, and for the statues, but there never anything there. Rarely see any greater shadow fiends in the forest. I have stopped checking the scrags altogether because I haven't managed to find an elder there in, oh.... six weeks? And then it was only into the first elder per group, and it got wiped out almost immediately. Long way to run to check, but I think there's either a cadre of low levels going there for XP, or the place just has such a slow respawn that it never grows. I ceased worrying about the werewolves ages ago. Even when my chars were low enough level to still hit the place, the spawn never went anywhere. Dire wolves? Mountain Loup-Garous? It was never happening. It was rare enough to see a worg and a low-land.
The mountain fane can reach a higher spawn, but that's because (for some reason) I think people still barely know of it's existence. It could use a remake and be given some more balls and area, like the swamp and the forest fanes. Despite there being demons there, Aluria can still solo the place without little fear save for getting stuck in a particularly bad storm of vengeance.
I haven't seen the nymph in months. Every time I've checked it, the place seems to have been wiped out. Barovia crypts, same.
Roaming ghosts on Ghakis get decently high. It's out of the way, and there's no treasure to speak of up there, so people only go for the XP.
I dunno. I miss vampires, and scrags most of all. Just never anything happening there, unless there's a DM.